Can you explain how they do not share knowledge?

They only incentivise defensive, litigious behaviour in the market.

1. A patent grants you a right

2. If someone threatens your right, you are going to defend it. Or are you suggesting that we should not use legal methods to defend our right? Any right? Or just patent rights is the exception you propose?

3. If you threaten other's right and they threaten yours, you have a way to negotiate at a table outside the court and save society's precious resources.

I still don't see how it's bad. Please enlighten me.